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Type VI, Oberndorf intermediate action
Action OAL: 8.750
Recvr screws, center to center: 7.835
Bolt body length: 6.165
Magazine length: 3.115
Receiver ring dia: 1.410, large ring
Barrel shank dia: .980, small shank

I call this the Oberndorf intermediate action, as they are the only ones who produced it. Commonly encountered models include:
1903 Turk
1909 Peruvian
1935 Argentine
Oberndorf Commercial

The 1903 Turk and the 1909 Peruvian also share some other qualities. They both have a very high clip bridge, and a long curved arm on the ejector box that puts pressure on a stripper clip loaded into the receiver, holding it in place. The 1935 Argentine and the Oberndorf commercial action do not have this.
This type has a longer than normal receiver ring, and a longer than normal cocking piece, with a shorter than normal bolt body, hard to figure where the weight savings come in!

M38 Turk
Action OAL: 8.750
Recvr screws, center to center: 7.835
Bolt body length: 6.370
Magazine length: 3.315
Recvr ring dia: 1.410 large ring
Barrel shank dia: .980 small shank

The K. Kale marked Mausers are usually considered to be indigenously made by the Turks starting in the 1940s. Others are the ANSFA Ankara marked Mausers which typically were made for the Turks by the Germans or Czechs to the large ring small shank parameters. Many of the 1903 Turk mausers found now were modified to the M38 standard. These will usually be marked ANKARA and may have a small half circle cut out of the top of the front ring depending on overall action lenght.

The "M38" Turk is a bit of a misnomer as it seems to be our casual identifier for this group of actions and not an offical designation by the Turks. ANKARA M38 mausers may be found with partially ground off GEW, Czech and BRNO markings.